PLATE 74. 



Fig. 1. 327. 8. Graptolithus Sagittarius. (Pag- 272.) 



1 a. A fragment of tlic slaic, showing three nearlv parallel stipes of this species. 



1 i. A magnified portion, showing the upper margin of the teeth to be nearly rectangular to the direction of 



the stipe, while the lower side is oblique. 



Fig. 2. 328. 9. Graptolithus tenuis. (Pag. 272.) 



2 a. Slender elongated stipes of this species, associated with G. sagUtariut, 

 •-' b. A portion of one of these magnified. 



'2 c. A small filiform stipe, gradually tapering and bent abruptly backwards. 



'i d. A portion of the same magnified, showing the serratures of the same character as the preceding. 



Fig. 3. 329. 10. Graptolithus sextans. (Pag. 273.) 



,3 a. A fragment of slate on which are two specimens of this species, with straight diverging branches. 



3 6. A portion of one of these magnified, showing the mucronate teeth. 3 c. Specimen with larger branches. 



3 d, d. Two specimens, showing the appendages at the base. 3 e. One of the last magnified. 



Fig. 4. 330. 11. Graptolithus furcatus. (Pag. 273.) 



4 a. .\u individual on the same stone with 3 d, showing the difference in form. 4 b. Magnified portion. 

 4 c. A small specimen, with the branches more converging than usual. 



4 d. A portion of the last magnified, showing no serratures on the inside of the branches. 



4 e. Another specimen, similar in form to 4 c. 



4/. A part of the same magnified, showing serratures on the inside of the branches. 



4 g. A specimen with elongated branches which cross each other. • 

 1 A. A part of the same magnified, showing both margins to be serrated. 



Fig. 5. 331. 12. Graptolithus serratulus. (Pag- 274.) 



5 a. A specimen of the natural size, diverging from a slender smooth spine or mucronate radicle below. 



5 i. A portion magnified, showing the form and opposite direction of the serratures at the base. 



Fig. 6. 332. 13. Graptolithus gracilis. (Pag. 274.) 



6 a, b. Two specimens (natural size), showing the principal stipe and branches, one of the latter being sub- 



divided. 

 ») c. A. .specimen in which the principal stipe is obscure : several branches are subdivided. A fragment of G. 



pristit, and of G. mucronatus, are shown on the same piece of slate. 

 6 d. A fragment magnified, showing the serratures of the branches. 



Fig. 7. 333. 14. Graptolithus? ljevis, (Pag. 274.) 



Fig. 8. 381. 15. Graptolituus arundinaceus. 



8. The specimen, natural size. 8 a. The same magnified. 



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